. out front tonight, barbara starr, pentagon correspondent. this is a new front. drones themselves have changed the entire way this country will fight war forevermore but let's start with the bioswimmer. what can it do? >> reporter: well, this is a very interesting project that was actually funded by the department of homeland security to basically -- it takes the shape of a tuna because tuna can maneuver in the water, they can get into small places, and the idea is if you could put sensors on this, cameras, acoustics, radar, whatever, you could put this kind of device into u.s. bombers, maybe to go through shipwrecks, maybe to go through underground debris, maybe just to keep watch for potential terrorist attacks on u.s. ports. the whole idea with all of these programs is that nature really is, you know, the best way. there's a good lesson to be learned here. these are devices that can move as they do in nature like a tuna. tuna is pretty good at getting through the tight spots under water. >> when you think about just under water, simple things, 90% of the world's goods go by ship. yo